My primary work is lawn care. I have a client who is looking for some shrub removal, fill, etc... He now tells me he would like block around the beds. I will need to go about 8-12 inches high. The wall will be about 150 feet long. Since this is the first time for me, what is the best way for a newbie to price it. Material + costs, material x 10, etc... For a seasoned person what is your time frame to lay this? Thanks for you advise.